Home / 21,569.78-29,766.30-12,138.55

Finding the Fourth Proportional to 21,569.78, 29,766.30 and 12,138.55

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Solution

The fourth proportional to 21,569.78, 29,766.30 and 12,138.55 is: 16,751.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,569.78 : 29,766.30 = 12,138.55 : x
  2. Step 2: Convert to fraction form
    21,569.78/29,766.30 = 12,138.55/x
  3. Step 3: Cross multiply
    21,569.78x = 29,766.30 × 12,138.55
  4. Step 4: Simplify right side
    21,569.78x = 361,319,720.87
  5. Step 5: Solve for x
    x = 361,319,720.87/21,569.78
  6. Step 6: Final answer
    x = 16,751.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.